Laser-Printed Display Body Packaging Delamination Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display bodies for packaging face issues with delamination due to external stimulation, limited concealment, and reduced print density, especially when using laser printing on transparent or heat-sensitive films, which affects the visibility and durability of printed information.
Innovation Solution
A display body with a white printing layer that uses laser printing pigments like titanium oxide or calcium carbonate, combined with voids to achieve high concealment and print density, while maintaining mechanical strength and preventing delamination, by controlling the color difference, luminous transmittance, and thickness changes upon laser irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a heat-sensitive layer is provided on a substrate film to enable direct printing, then productivity increases and labor costs decrease, but the heat-sensitive layer may delaminate due to rubbing or external stimulation
Solution Approach 1:
The patent applies composite materials by creating a multi-layer structure consisting of a substrate film and a heat-sensitive layer that is chemically or physically bonded to it. This composite structure maintains the printability of the heat-sensitive layer while preventing delamination through strong interlayer adhesion, thus resolving the contradiction between productivity improvement and reliability maintenance.
2Reliability
If coating is used to provide functional layers including protective layers, then the substrate gains necessary functionality, but the number of operations increases reducing productivity
Solution Approach 1:
The patent merges the substrate film and heat-sensitive layer into a single integrated composite structure that can be manufactured in one process. This eliminates the need for separate coating operations to apply protective or functional layers, thereby maintaining functional integrity while significantly improving productivity by reducing the number of manufacturing steps.
3Reliability
If multiple functional layers with particles are added to improve performance, then functionality increases, but transparency decreases and layer thickness increases
Solution Approach 1:
The patent applies local quality by concentrating functional particles only in specific regions or layers where they are most needed, rather than distributing them uniformly throughout all layers. This localized approach maintains the necessary functional performance while minimizing the impact on overall transparency and keeping layer thicknesses optimized.
4Quantity of substance
If printing size is reduced to increase information density, then more information can be displayed, but spreading causes resolution to remain at approximately 0.2 mm which is the limit of visual perception
Solution Approach 1:
The patent applies parameter changes by modifying the physical and chemical properties of the heat-sensitive layer to enable sharper, more defined printing characteristics. This includes adjusting particle size, distribution, and thermal response parameters to achieve print resolution below the traditional 0.2 mm limit, allowing for smaller text and higher information density while maintaining visual clarity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables high-quality, durable, and visually distinct printing on packaging without delamination, improving concealment and print density, and maintaining mechanical strength, thus reducing waste and mistaken labeling.
Implementation Method 1
there is at least one white printing layer permitting printing by means of laser irradiation; said white printing layer has a nonprinted region and a printed region at which laser printing has been carried out
Implementation Method 2
laser printing pigment in the form of at least one species—whether alone or as a compound—selected from among the group consisting of bismuth, gadolinium, neodymium, titanium, antimony, tin, aluminum, calcium, and barium is present within the white printing layer
Data Source
AI summary
A display body characterized in that there is at least one white printing layer permitting printing by means of laser irradiation; said white printing layer has a nonprinted region and a printed region at which laser printing has been carried out; and (1) through (3) are satisfied. (1) An absolute value of a difference in color L* values between the printed region and the nonprinted region is not less than 1.0 but not greater than 10.0. (2) Total luminous transmittance of the nonprinted region is not less than 8% but not greater than 50%. (3) Fractional decrease in thickness of the printed region in a cross-sectional direction is not less than 1 vol % but not greater than 80 vol % of that of the nonprinted region. A high-quality display body, with high productivity is provided.